TESCAN FIB-SEM LYRA3 used for TEM lamellae preparation in neutron damage studies

May/25/2017
Beam-contamination-induced compositional alteration and its neutron-atypical consequences in ion simulation of neutron-induced void swelling.
In this study, it is shown that Coulomb force drag by ion beams can introduce significant amounts of carbon, nitrogen, and oxygen into target materials even under ultra-high vacuum conditions. The findings of this work are a significant step toward developing standardized procedures for emulating neutron damage. The TESCAN FIB-SEM LYRA3 was used to prepare the TEM specimens analysed in this study.

Typical STEM-HAADF (a–d) and dark-field (e–h) images of unirradiated HT9 and HT9 irradiated without filtering to 200, 400, and 600 dpa, respectively. A depth scale to 1200 nm below the surface is provided next to (a,e). The g = ⟨100⟩ vector is labeled in the dark-field micrographs. A black arrow in (d) marks an isolated large void in the 600 dpa specimen.
Typical STEM-HAADF (a–d) and dark-field (e–h) images of unirradiated HT9 and HT9 irradiated without filtering to 200, 400, and 600 dpa, respectively. A depth scale to 1200 nm below the surface is provided next to (a,e). The g = ⟨100⟩ vector is labeled in the dark-field micrographs. A black arrow in (d) marks an isolated large void in the 600 dpa specimen.


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